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#ifndef UAPI_UFS_IOCTL_H_
#define UAPI_UFS_IOCTL_H_
#include <linux/types.h>
/*
* IOCTL opcode for ufs queries has the following opcode after
* SCSI_IOCTL_GET_PCI
*/
#define UFS_IOCTL_QUERY 0x5388
/**
* struct ufs_ioctl_query_data - used to transfer data to and from user via ioctl
* @opcode: type of data to query (descriptor/attribute/flag)
* @idn: id of the data structure
* @buf_size: number of allocated bytes/data size on return
* @buffer: data location
*
* Received: buffer and buf_size (available space for transfered data)
* Submitted: opcode, idn, length, buf_size
*/
struct ufs_ioctl_query_data {
/*
* User should select one of the opcode defined in "enum query_opcode".
* Please check include/uapi/scsi/ufs/ufs.h for the definition of it.
* Note that only UPIU_QUERY_OPCODE_READ_DESC,
* UPIU_QUERY_OPCODE_READ_ATTR & UPIU_QUERY_OPCODE_READ_FLAG are
* supported as of now. All other query_opcode would be considered
* invalid.
* As of now only read query operations are supported.
*/
__u32 opcode;
/*
* User should select one of the idn from "enum flag_idn" or "enum
* attr_idn" or "enum desc_idn" based on whether opcode above is
* attribute, flag or descriptor.
* Please check include/uapi/scsi/ufs/ufs.h for the definition of it.
*/
__u8 idn;
/*
* User should specify the size of the buffer (buffer[0] below) where
* it wants to read the query data (attribute/flag/descriptor).
* As we might end up reading less data then what is specified in
* buf_size. So we are updating buf_size to what exactly we have read.
*/
__u16 buf_size;
/*
* placeholder for the start of the data buffer where kernel will copy
* the query data (attribute/flag/descriptor) read from the UFS device
* Note:
* For Read/Write Attribute you will have to allocate 4 bytes
* For Read/Write Flag you will have to allocate 1 byte
*/
__u8 buffer[0];
};
#endif /* UAPI_UFS_IOCTL_H_ */
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